Abstract
In the field of microwave-absorbing materials, functional powder has always been the focus of research. In order to fabricate lightweight and flexible garment materials with microwave-absorbing function, the current work was carried out. Firstly, the general properties of polyurethane (PU) matrix composites reinforced with various microwave-absorbing powders were studied, and the carbon nanotubes (CNTs)/Fe3O4/PU film was proven to have the best general properties. Secondly, the needle-punched polyester (PET) nonwoven fabrics in 1 mm-thickness were impregnated into PU resin with the same composition of raw material as Fe3O4/CNTs/PU film, thereby the microwave-absorbing nonwovens with gradient structure were prepared. Moreover, the absorbing properties of the CNTs/Fe3O4/PU/PET gradient composites were tested and analyzed. Finally, the relationship between the mass ratio of CNTs and Fe3O4, and the microwave-absorbing properties was studied. The results show that the mass ratio of CNTs/Fe3O4 has a significant effect on the microwave-absorbing property of CNTs/Fe3O4/PU/PET. When the mass ratio of CNTs/Fe3O4 is 1:1, the prepared CNTs/Fe3O4/PU/PET gradient composite can achieve effective reflection loss in the range of more than 2 GHz in Ku-band (12–18 GHz), and the minimum reflection loss reaches −17.19 dB.
Highlights
At present, the rapid diffusion of electronic products produces a great number of radiations of electromagnetic waves around human beings [1,2]
Microwave-absorbing functional powder has always been the focus of research in the field of microwave-absorbing materials
Through the comparison of properties such as tensile strength, adhesion, and antistatic ability, we found that the carbon nanotubes (CNTs)/Fe3 O4 /PU film has the best general performance
Summary
The rapid diffusion of electronic products produces a great number of radiations of electromagnetic waves around human beings [1,2]. Wang et al [13] prepared a flexible microwave-absorbing film based on graphene oxide/carbon nanotubes and Fe3 O4 nanoparticles, which has been proven to have excellent microwave-absorbing properties in the range of 2–18 GHz. Due to its special properties, Fe3 O4 is often used as a filler to make composite materials with microwave absorption or electromagnetic shielding functions. The prepared non-woven fabric materials in our job with microwave absorption function can be used for human body wear, reduce the harm of electromagnetic waves to the human body, and has high application value in the medical field. The experimental tests proved that Fe3 O4 and CNTs have outstanding general performance, suitable for the preparation of wearable non-woven fabrics with microwave-absorbing function. The microwave-absorbing performance of the gradient composite was tested, and it was proven that both the Fe3 O4 content and the gradient structure have a great influence on the microwave absorption effect
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